Buy a house in Lagny-le-Sec

In Lagny-le-Sec, the median price of a house is €2,864/m², roughly €323,421 for an average-size house (113 sq m). Your budget depends on your down payment and borrowing capacity, and you should add notary fees (about 7 to 8% on existing properties).

On an existing property, transfer duties and notary fees run at about 7 to 8% of the price. For a purchase at the median price of a house in Lagny-le-Sec (€323,421), that is roughly €22,639 to €25,874 to be covered by your own funds, on top of the price. (Indicative calculation, not a quote.)

Over the 12 months ending 31 December 2025, the DGFiP recorded 14 sales in Lagny-le-Sec (1 apartments and 13 houses). These are the real transactions Briveo uses to price a property, never an estimate of our own.

On the median apartment price, compared with Lagny-le-Sec, Nogent-sur-Oise is about 57% cheaper (€1,511/sq m), and Chantilly is about 10% more expensive (€3,868/sq m). Widening the search to neighbouring towns is often what makes the budget work; each of them has its own price page.

Your borrowing capacity depends on your income (debt-to-income ratio capped at 35%, insurance included) and the loan term. In Lagny-le-Sec, a purchase at the median price of a house means financing about €323,421. Use our mortgage simulator to estimate your budget, and read our financing guide.

Checks run before any listing is published on Briveo, and they depend on the channel. A property marketed BY BRIVEO under a mandate requires a signed, unexpired mandate (French Hoguet law), the energy performance certificate with its report and still valid, and complete fee and co-ownership disclosures. A listing published by a private seller, which Briveo hosts without acting as intermediary, requires the energy and greenhouse-gas ratings (French Building Code art. L.126-33) and the co-ownership disclosures, but no mandate. Briveo is not the intermediary for that sale. Every card states which of the two it is.

Yes. Set up an alert with your criteria (budget, surface, number of rooms) and you will be notified as soon as a new matching property is published in Lagny-le-Sec.